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I personally wouldn't even entertain the idea of buying a down product that wasn't from a reputable brand.. and even then to a degree, but it's each to their own.
The other thing worth noting is that with only 150g of 650fp down, I'd take the temp ratings with a LARGE pinch of salt. A Rab Neutrino 200 is a full bag with 200g of 800fp filling and it's ratings are only 1-2 degrees better than the nature hike. I'm sure the nature hike would be better than nothing but not even close to what they claim.
ThePeginator-
The unknown sourced down is a reasoable concern.
The temp rating being lower isn't so important as i was thinking of still using a sleeping bag but wanted something easily packable and cheap to use as an underquilt in addition.
Another idea just buy a bit of tyvek and add loops to it so I can hang it on the underside to block windchill
laner
my plan for a cheap undequilt for hammock camping this summer is getting a half down bag from aliexpress which has a zipped hole in the bottom https://www.aliexpress.com/item/Naturehike-Factory-Store-Ultralight-Half-Chest-Strap-Duck-Down-Sleeping-bag-outdoor-camping-hiking-goose-Down/32846397564.html